According to Cisco.com the latest firmware on there site is
7941-7961 Not Available, 7942-7962 9.4.2SR3, 7945-7965 9.4.2SR3, 7970-7971 Not Available, 7975 9.4.2SR4.
I cannot see any firmware for 7900 phones that is 9.4.3 on Cisco Website.
According to Cisco.com the latest firmware on there site is
7941-7961 Not Available, 7942-7962 9.4.2SR3, 7945-7965 9.4.2SR3, 7970-7971 Not Available, 7975 9.4.2SR4.
I cannot see any firmware for 7900 phones that is 9.4.3 on Cisco Website.